tonight, deadly heat. etwo-thirds of th nation sweltering in dangerous mperatures. areas hitting higher than 110. >> it's exhausting and it's hot. >> it is real, real hot. powers ds of without power. our medical correspondent with a demonstration. >> i'm starting to feel a little light-headed. new video from laran. they the moment they seized the british oil tanker, e th u.k. calling it a

hostile act as the u.s. sends troops to the region. nt presiderump on the been to the prime minister of sweden asking to let the american rapper free rocky go. the prime minister responds. highway murder, an american and her boyfriend killed while road tripping in canada. the police asking for clues. >> it was like the most perfect love story you would read from books. >> her family reeling tonit. panic on the tarmac. an intru breaks on to a runway. then on to a plane's wing. nepolice, o giant leap. celebrations for one emf the greatest achits of man. tonight the lost tapes of the moon landing recently discovered. the clearest video yet. >> this is nbc "nightly news" with jose diaz. >> good evening. a dangerous and deadly f eat wave is baking much oe country with temperatures so

intense that entire cities are under emergency alerts. morehan 150 million people are affected. at least three -r heated deaths have been reported so far. hospital emergency rooms are seeingn increase in patients with heat exhaustion. it comes on quickly and can be deadly. we have angles covered from the forecast and health impacts. lwe begin here in centark with our own kathy park. there's very little relief, evenn the shade. >> reporter: jose, good evening. it would typical a very busy evening in central park. the heat wave has kept th crowds relatively new york braces for round two tomorrow. in new york city subways -- >> i'm dying to get out. >> reporter: on the hottest day of the year. >> the heat is just so overwhelming. >> reporter: underground no, srelief. part of the city feel like 111. new york is one of many states in the

meast inidwest under ncangerous heat emerges this weekend. add humidity to the mix and it is brutal. it feels like 112 in d.c. 105 in chicago and wichita, too. >> another dangerously hot day is on tap. >> the extreme heat is pushing power grids to the limit. >> everyone is running an air conditioner. >> reporter: con edison doing everything it can to ackout.t a >> are you prepared? >> we are prepared. we've called in over 4,000 extra crew members to wait on standby just in case any outages occur. >> reporter: roads take hit, too. this interstate in south dakota buckled, cracking under a heat index of 110 degrees. the heat so dangerous r young and old. in philadelphia, a senior center was evacuated after its air conditioning failed. and in michigan, a store knocked out power to more than 200,000. despit the heat, the

hearty race in today's new jersey triathlon but it wasn't easy. >> trying to power through. but i felt like i was having a heart attack. >> reporter: any ol off, a welcome relief for these families in new york city play grounds who know the worst is not over just yet. and as the sun is beginning to set, notmu relief. we're still feeling the heat even at this hour. >> kathy park in new york city. thank you.fi ofals fear the nonstop assault of hot days and hot nights could lead to more heat-related fatalities. our medical correspondent demonstrate on himself just how serious the effects of heat can be and how quickly they can come on. across the country, deadly heat. >> you're out jogging in entral park. how do you feel? >> like i'm evaporating. >> reporter: in brooklyn, new york, dr. john marshall is seeing more patients with heat-related

illness. why is this so dangerous? >> we've seen rising temperatures over t last several years. as the temperatures get higher, the risk of heat injury, the number of people who die of heat-related deaths goes up eve single year. >> reporter: while being outdoors and active, being outside without air conditioning is also risky. over the next few minutes, i'm going to see what happens to the human body as it starts heating up. the temperature here, 93. >>es it only takes two minutes for my pulse to start to race. hewhen i walked in t door, my heart rate was 63. looking at it now after just six minutes, it is above 10 and then my temperature changes. but my temperature has gone down. 96.8. that's lower than normal because my body is compensating for the heat by ercooling it. >> reporter: 21 minutes in over he. >> i just started feeling a headache come on. one of the first signs of h texhaustion.

>> i'm starting to feel a little light-headed. it is time to call it quits. fast pulse, heavy sweating, headache, feeling light-headed. symptoms of heat exhaustion to watch tfor beforehey become life threatening. luis jimenez was on the way to work when he had to go to the e.r. >> i felt dizzy and wobbly. i thought i was having a heart attack. >> it was the heat. >> it was the heat. >> the doctor joins us now. the heat impacted you so severely, so quickly. but it is even more dangerous for other people. >> i'm a healthy guy but i only la an hour at the heat indelve of 100. those taking di metions, young children, they're the will have the most problems with this. it is time to start looking out for each other. >> and quickly these things can happen. >> very quickly. >> this dangerous heat

isn't goingway any time soon. janice, are we through the worst of it? >>unfortunately, no. we have one more day where it coulde hotter in some areas. from the east coast to the midwest and the plains. this is what it feels like right now. the ht index values when you take temperature and add in the humidity, it feels like 99 in new york city. 101 innashville. and tomorrow, it will feel even hotter in some spots. 108 will be the heat index in new york city. 110 in washington, d.c. and 111 in norfk, rginia. that's dangerous, excessive heat. but there is some relief coming. on monday, aold front slides south and the temperatures will cool down and the humidity drops from binghamton back to the ohio valy and eventually the northeast as well. >> thank you very much. >> turning overseas where iran has released new footage they say shows the forces taking over a british tanker. it ishe haste move

raoning up tensis in the region. hans nichols has this report. >> reporter: tonight iran releasi dramatic video, claiming to show the revolutionary guards seizing a briti oil tanker. commandos wearing ski masks and machine guns preparing toappel down on to the ship's decks. in london, a search for ways to de-escalate the tension. >> we're very clear that we will do what it he's the secure the safety and security of british and international shipping. >> reporter: in iran, continued defiance. >> reporter: it shouldn't come as a surprise that iran sees the british tanker on the fourth of jy an iranian super tanker was seized by the u.k. it provoked a response by the sprewell leader violence and vowed not to let it go answered. >> reporter: >> no doubt about it. no. we shot it down. >> reporter: theta ste

tv showing this footage proposing it s from that very grown it clearly i view. and the pentagon announcing more u.s. troops on the way to the region. with secretary of state mike pompeo insisting that the diplomatic door is still open. he>> these are not t actions of a country that looks like it is headed in the right direction. we hope as president , that has sa they will sit down and discuss these items with us. >> reporter: and there is late word on how the british plan to sp red? >> reporter: yes. the foreign secretary may propose freezing iranian assets to target theregime. president trump working the phones today. another international incident. thisnvolved a rapper jailed in sweden. he even offered something of his to bail out the >> reporter: he's the

american rap star whose music has gone rldwide. but now he is making headnes for anything but the music. after video of this june 30th fight othe streets of stockholm landed the 30-year-ol harlem, new york native in a swedish jail. the rapper claims self-defense posting this video minutes fight broke out. >> you don't want no problem with these boys. >> reporter: but the swedish authorities say he must remain nd bears as they investigate. his situation sparringing support from social media, all the way to the oval office. >> i've been called by so many people asking me to help him. the one who knew about him was our first lady, right? she was telling me abt him. can you help him? >> in a phone call 28 the swedish bright, he was assured a sap

rocky was not a flight rick. his case already drawing comparisons to another american artist. the swedish police arrested him on drug charges but struck a deal 36 hours later. on twitter, he said the only difference comes down to white privilege and systemic racism by the swedish government. >> i'm sure in court it will shown that he's innocent. that he acted in lf-defense. >> reporter: with the swedish court askg for time to build the case, he remains behind bars out of sight but in the spotlight. nbc news. an update on a mystery we've been tracking on this broadcast. a set of bones located under the vatican were exhumed today. they are tg to find out if they hold the secret to the decades disappearance. >> reporter: new clues in a decades old

mystery. tonight vatican recovering two sets of bones. possible clues inne of italy's most famous cold cases. 15-year-old emmanuela, the daughter of a vatican bank employee, vanished in 1983 after attending a immumusic lesson. her disappearance was never so. it sparked conspiracy theories and even a film. her family has never stopped pressing investigators. her brother says we will never take a step back. earlier this year, emmanuela's family received an anonymous tip telling them on search where an angel is looking on. that led investigators to the tomb of the jeh, meant to held to remains of two 19th century princesses. the too many was broken open but in a shocking twist, they were empty. isno sign of his sr or the jerel an

princesses. two days later this vatican said it had discovered two more sets of bones near mb tonight those bones are being sent for testing. could ess that take weeks. and hopefully offer answers after decades of questions. sarah harmon, nbc news. still ahead, the der mystery still ahead, the der mystery of a young c ou i didn't have to call 911.anlp. d i didn't have to come get you. because you didn't have another heart attack. not today. you ok our conversation about your chronic coronary artery disease to heart. even with a stent procedure, your condition can get worse over time, and keep you at risk of blood clots. so you added xarelto®, to help keep you protected. xarelto®, when taken with low-dose aspirin, is proven to further reduce the risk of blood clots that can cau heart attack, stroke, or cardiovascular death in people with chronic cad. that's because while aspirin can help, it may not be enough to manage your risk of blood clots. in a clinical trial, almost 96% of people taking xarelto®

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passengersboard a plane watched with rror as a man jumped on to the wing of their aircraft and tried access the cabin it as it prepared for takeoff. a viral video shot by a passenger, a man crawls along the wing asic pan eresults. it was to be an epic trip for a couple in canada. it end in the tragedy on the side of the road. police are asking the help in fighting the killer. molly hunter has more. >> reporter: a mysterious double murder and now manhunt of the. >> we're trying tode termine whether this is targeted or whether it was a crime of opportunity. >> reporter: on are te highway in canada's british columbia, 21 hours north of vancouver, 21-year-old chynna

deese from canada a her australian boyfriend lucas fowler etere on a road trip. they in croatia traveling the world. >> it seemed like the free spirited butt butterfly that traveled the world met another. eporter: the van broke down on highway 97. within 24 hours, they were dead. sandra was one of the last people to see the couple. >> they didn't seem to be that concerned. they seemed to be okay. oike they were not in a pan anything. >> reporter: that was sunday afternoon. between the hours of 4:00 p.m. and around 7:00 a.m. monday morning, they were shot. their bodies found on the side of the road. hetheir blue colet 1986 van spotted nearby. >> these are two people that traveled or around the wld and were not people to be caught on guard. >> reporter: the fowlers are on the way to canada saying to loseeone so young and vibrant is devastating. canadian police asking anyone with a dash cam who may have traveled

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promises internet over your phone. one chinese company, huawei is leading the competition but the u.s. government has called them a national security threat. janice got rare access inside the company president trump has called dangerous. >> reporter: at a sprawling campus of castles and cafes that looks like europe, but is actually in china, the future of the internet is being built by huawei. t thh giant spending billions to gain the edge in 5g. the next generation wireless network. an act the u.s. government is trying hard to stop. >> how would you like it, we've never asked the question, if we were to come into the u.s.? what are the rules? >> so there's no communication with the u.s. government. >> bizarre, isn't it? >> reporte we were given special access to the company president trump has called dangerous, to showhat's at stake --

>> there's a rock. >> reporter: right now, 5g is enabling the phone to take me into this environment. but in the future, it will all go -- directly into the goggles. and what's possible in a world trans formed by 5g that will power everything from driverless cars to factories to robotic surgery. within a few years, roof tops and lamp posts will this as 5g connects the tops, internet and people. but the potential is also the problem for the u.s. government whh has indicted huawei and banned from supplying components he over fears t equipment may have malicious back doors. for china's government to spy. the founder denies it though a national intelligence law here can order chinese

companies to cooperate. in the u.s., a bipartisan gro of senators wants an even tougher ban. >> the government of china canal essenti commandeer huawei when it wants to. ultimately it is a command economy and they can take over huawei. >> reporter: the risk now, a technology cold war that could put the u.s. behind others in 5g coectivity. >> why doesn't the s. u.rust huawei? >> i think we've not engaged appropriately and fearyo fear what you don't know. fear what you don't know. >> reporter: nbc and i recently had hi, ia heart attack. it changed my life. but i'm a survivor. after my heart attack, my doctor prescribed brilinta. it's for people who have been hospitalized for a heart attack. brilinta is taken with a low-dose aspirin. no more than 100 milligrams as it affects how well brilinta works. brilinta helps keep platelets from sticking togeer and forming a clot. in a clinical study,ta brilin worked better than plavix. brilinta reduced the chance of having another heart attack...

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todtar gazers of all ages are celebrating 50 years to the day since neil armstrong first step d on the moon. it was the live tv npictures of the moo walk that helped make it a permanef part o america's collect memory. now we have an even clearer version of it. here'snbc's kevin tibbles. >> reporter:e have lift off! >> reporter: 50 years heago today, t dream of the man on the moon came true. >> that's one small step for man. one giant leap for mankind. >> reporter: that moment still resonates. 650 million people worldwide watched those first grainy images. >> my parents were so

excited, they re almost crying. >> beautiful, just beautiful. >> it's amazing. they went up, land, turned around and came back. >> reporter: 50 years ago my dad took the three of us kids all out and bought us a newspaper. this one is mine and i still look at it from time to time and dream. gary george was a dreamer, too, who went etrom building backyard rocks with friends to an internship wh nasa's engineer team. for $218, he bought a bunch of surplus government vide tametapes and made a discoveryof is own. original recordings from the moon. >> i got these three reels of tape thatwe labeled apollo 11 eva. and dad being the space buff tt he was, he looked at that dand he said, i't think i would give those away. i think i would hang on to those. those might be valuable someday. >> reporter: that someday is today. the tapes are being auctioned at sutherbyes, billed as

the only surviving cording of the moon walk. he says it's cleaner than what has een seen before before it was recorded on the tfeed straight from moon. all on recording sare a lesser quality. >> the moo walk is the only one in human history where the whole world was united, for good reason. >> reporter: here in chicago's museum science and industry, th take visitors back to the excitement of the apollo missions. y >> it was a v inspirational and historic moment. >> reporter: people have been cominto ther to relive it ever since. and now it will remain video.rved on >> a kangaroo hop. >> i'm just glad that i could have a role in saving them. >> reporter: kevin tibbles, nbc news, chicago. >> and that tape was sold today for $1.8

million. that's nbc "nightly news" for this saturday. on tomorrow's showwi kate snow, the president called a new factory the eighth wonder of the world. why residents of one small town are now

when we'll catch a break from this dangerous heat. monday. >> reset the tempo. playing for one another. we got everything it takes the fourth quarter, give one, two, three! >> t >> mp thedle. he is sacked! >> he's a bad man. >> in 2018, the washington redski. >> touchdown! davis!